The Product System and its subsystem layers encompass the entire product lifecycle. There is one product core process for each state of the lifecycle. In this diagram, there are four lifecycle states and thus four core processes. The Product Defining core process corresponds to state t1, the Product Developing core process to state t2, etc.

A similar structure is shown for the Resource System.
©1995-2012 Ackley Associates   Last revised: 12/10/10